/Engine/Source/Developer/ToolWidgets/Public/Filters/SCustomTextFilterDialog.h
Handler for when the color block is clicked to open the color picker
[FReply](API\Runtime\SlateCore\Input\FReply) ColorBlock_OnMouseButtonDown ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & MyGeometry, const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) & MouseEvent )